Why there's a 'blank line' on CSV file?

[brunolelli]

Hello guys,

With the following code I'm exporting my data to a CSV file:

from tempfile import NamedTemporaryFile
from FlightRadar24.api import FlightRadar24API
from time import time, sleep
from datetime import datetime
import shutil
import csv
import threading
import schedule 
import time 
import sched, time

s = sched.scheduler(time.time, time.sleep)
def do_something(sc): 
    print("Doing stuff...")

    now = datetime.now()
    dt_string = now.strftime("%d/%m/%Y %H:%M:%S")
    company1 = len(fr_api.get_flights(airline = 'AZU'))
    company2 = len(fr_api.get_flights(airline = 'GLO'))
    company3 = len(fr_api.get_flights(airline = 'LAN'))
    company4 = len(fr_api.get_flights(airline = 'PTB'))
    
    print(dt_string, company1, company2, company3, company4)
    fields=[dt_string,company1,company2,company3,company4]


    with open(r'C:\Users\bruno\Desktop\Voos\Voos.csv', 'a') as f:
        writer = csv.writer(f, delimiter=';')
        writer.writerow(fields)   

    
    s.enter(60, 1, do_something, (sc,))

s.enter(60, 1, do_something, (s,))
s.run()

When I print it, I get the values line by line...

print(dt_string, company1, company2, company3, company4)


23/03/2021 09:09	50	18	34	1				
23/03/2021 09:09	50	18	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	50	19	34	1				
23/03/2021 09:09	51	19	34	1				
23/03/2021 09:09	51	19	34	1				
23/03/2021 09:09	51	19	34	1

But when I open my csv file, the results are separated by an empty line... like this:

23/03/2021 09:09	50	18	34	1
				
23/03/2021 09:09	50	18	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	50	19	34	1
				
23/03/2021 09:09	51	19	34	1
				
23/03/2021 09:09	51	19	34	1
				
23/03/2021 09:09	51	19	34	1

What's going on?
How can I fix it, and get the values on my csv file without the blank line?

Thank you!

[snippsat]

If i just copy some of your data,then doing some stuff to get it in a list data structure.
You can append to list so get similar structure,then it easy to write to csv.

import csv

data = '''\
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  19  34  1
23/03/2021 09:09    50  19  34  1'''

lst = data .split('\n')
lst = [i.split() for i in lst]
print(lst)

with open("out.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerows(lst)

Output:
[['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1']]

# out.csv
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,19,34,1
23/03/2021,09:09,50,19,34,1

[brunolelli]

If i just copy some of your data,then doing some stuff to get it in a list data structure.
You can append to list so get similar structure,then it easy to write to csv.

import csv

data = '''\
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  19  34  1
23/03/2021 09:09    50  19  34  1'''

lst = data .split('\n')
lst = [i.split() for i in lst]
print(lst)

with open("out.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerows(lst)

Output:
[['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1']]

# out.csv
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,19,34,1
23/03/2021,09:09,50,19,34,1

Thank you for your assistance, but I don't think it will work...
As you can see, I'm writing my data from this code

fields=[dt_string,company1,company2,company3,company4]

And it's already a list...
And I'm basically printing or writing line by line of this list, because purely it's a list with just one line that I'm writing every second basically

[brunolelli]

If i just copy some of your data,then doing some stuff to get it in a list data structure.
You can append to list so get similar structure,then it easy to write to csv.

import csv

data = '''\
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  18  34  1
23/03/2021 09:09    50  19  34  1
23/03/2021 09:09    50  19  34  1'''

lst = data .split('\n')
lst = [i.split() for i in lst]
print(lst)

with open("out.csv", "w", newline="") as f:
    writer = csv.writer(f)
    writer.writerows(lst)

Output:
[['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '18', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1'],
 ['23/03/2021', '09:09', '50', '19', '34', '1']]

# out.csv
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,18,34,1
23/03/2021,09:09,50,19,34,1
23/03/2021,09:09,50,19,34,1

Thank you for your assistance, but I don't think it will work...
As you can see, I'm writing my data from this code

fields=[dt_string,company1,company2,company3,company4]

And it's already a list...
And I'm basically printing or writing line by line of this list, because purely it's a list with just one line that I'm writing every second basically

I found a way to solve my issu.... Saving as TXT!

[buran]

You are on Windows, open the out file with newline=''. It is in the docs. See also https://stackoverflow.com/a/3348664/4046632